/*
 *
 * This file is part of the iText (R) project.
    Copyright (c) 1998-2019 iText Group NV
 * Authors: Balder Van Camp, Emiel Ackermann, et al.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License version 3
 * as published by the Free Software Foundation with the addition of the
 * following permission added to Section 15 as permitted in Section 7(a):
 * FOR ANY PART OF THE COVERED WORK IN WHICH THE COPYRIGHT IS OWNED BY
 * ITEXT GROUP. ITEXT GROUP DISCLAIMS THE WARRANTY OF NON INFRINGEMENT
 * OF THIRD PARTY RIGHTS
 *
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
 * or FITNESS FOR A PARTICULAR PURPOSE.
 * See the GNU Affero General Public License for more details.
 * You should have received a copy of the GNU Affero General Public License
 * along with this program; if not, see http://www.gnu.org/licenses or write to
 * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
 * Boston, MA, 02110-1301 USA, or download the license from the following URL:
 * http://itextpdf.com/terms-of-use/
 *
 * The interactive user interfaces in modified source and object code versions
 * of this program must display Appropriate Legal Notices, as required under
 * Section 5 of the GNU Affero General Public License.
 *
 * In accordance with Section 7(b) of the GNU Affero General Public License,
 * a covered work must retain the producer line in every PDF that is created
 * or manipulated using iText.
 *
 * You can be released from the requirements of the license by purchasing
 * a commercial license. Buying such a license is mandatory as soon as you
 * develop commercial activities involving the iText software without
 * disclosing the source code of your own applications.
 * These activities include: offering paid services to customers as an ASP,
 * serving PDFs on the fly in a web application, shipping iText with a closed
 * source product.
 *
 * For more information, please contact iText Software Corp. at this
 * address: sales@itextpdf.com
 */
package com.itextpdf.tool.xml.parser.state;

import com.itextpdf.tool.xml.parser.State;
import com.itextpdf.tool.xml.parser.XMLParser;

/**
 * @author redlab_b
 *
 */
public class TagEncounteredState implements State {

	private final XMLParser parser;

	/**
	 * @param parser the XMLParser
	 */
	public TagEncounteredState(final XMLParser parser) {
		this.parser = parser;
	}

	/*
	 * (non-Javadoc)
	 *
	 * @see com.itextpdf.tool.xml.parser.State#process(int)
	 */
	public void process(final char character) {
		String tag = this.parser.bufferToString();
		if (Character.isWhitespace(character) || character == '>' || character == '/' || character == ':' || character == '?' || tag.equals("!--") || tag.equals("![CDATA") && character == '[') {
			// cope with <? xml and <! DOCTYPE
			if (tag.length() > 0) {
				if (tag.equals("!--")) {
					this.parser.flush();
					this.parser.memory().comment().setLength(0);
					parser.selectState().comment();
                    // if else structure added to check for the presence of an empty comment without a space <!---->
                    // if this check isn't included it would add the third dash to the stringbuilder of XmlParser and
                    // not to memory().comment() which caused CloseCommentState to keep adding the rest of the document
                    // as a comment because it checked the closing tag on the length, which would be 1 in this case
                    // (the fourth dash)
                    if ( character != '-' ) {
                        this.parser.append(character);
                    } else {
                        this.parser.memory().comment().append(character);
                    }
				} else if (tag.equals("![CDATA") && character == '[') {
					this.parser.flush();
					parser.selectState().cdata();
				} else if (tag.equals("!DOCTYPE")) {
					this.parser.flush();
					parser.selectState().doctype();
					this.parser.append(character);
				} else if (Character.isWhitespace(character)) {
					this.parser.memory().currentTag(this.parser.bufferToString());
					this.parser.flush();
					this.parser.selectState().tagAttributes();
                } else if (character == '>') {
					this.parser.memory().currentTag(tag);
					this.parser.flush();
					this.parser.startElement();
					this.parser.selectState().inTag();
				} else if (character == '/') {
					this.parser.memory().currentTag(tag);
					this.parser.flush();
					this.parser.selectState().selfClosing();
				} else if (character == ':') {
					this.parser.memory().namespace(tag);
					this.parser.flush();
				}
			} else {
                if (character == '/') {
				    this.parser.selectState().closingTag();
			    } else if (character == '?') {
                    this.parser.append(character);
                    this.parser.selectState().processingInstructions();
                }
            }
		} else {
			this.parser.append(character);
		}
	}
}
